Page 1
MIC912 Micrel
MIC912
200MHz Low-Power SOT-23-5 Op Amp
General Description
The MIC912 is a high-speed, unity-gain stable operational
amplifier. It provides a gain-bandwidth product of 200MHz
with a very low, 2.4mA supply current, and features the tiny
SOT-23-5 package.
Supply voltage range is from ±2.5V to ±9V, allowing the
MIC912 to be used in low-voltage circuits or applications
requiring large dynamic range.
The MIC912 is stable driving any capacitative load and
achieves excellent PSRR, making it much easier to use than
most conventional high-speed devices. Low supply voltage ,
low power consumption, and small packing make the MIC912
ideal for portable equipment. The ability to drive capacitative
loads also makes it possible to drive long coaxial cables.
Features
• 200MHz gain bandwidth product
• 2.4mA supply current
• SOT-23-5 package
• 360V/µs slew rate
• drives any capacitive load
Applications
• Video
• Imaging
• Ultrasound
• Portable equipment
• Line drivers
Ordering Information
Part Number Junction Temp. Range Package
MIC912BM5 –40°C to +85°C SOT-23-5
Pin Configuration
IN+
OUTV+
13
2
Part
Identification
A23
45
IN–
V–
SOT-23-5
Pin Description
Pin Number Pin Name Pin Function
1 OUT Output: Amplifier Output
2 V+ Positive Supply (Input)
3 IN+ Noninverting Input
4 IN– Inverting Input
5 V– Negative Supply (Input)
Functional Pinout
IN+
45
IN–
OUTV+
13
2
V–
SOT-23-5
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com
June 2000 1 MIC912
Page 2
MIC912 Micrel
Absolute Maximum Ratings (Note 1)
Supply Voltage (V
Differentail Input Voltage (V
Input Common-Mode Range (V
– VV–)...........................................20V
V+
IN+
– V
IN+
) ..........8V, Note 4
IN–
, V
) .......... VV+ to V
IN–
Operating Ratings (Note 2)
Supply Voltage (V
Junction Temperature (T
Package Thermal Resistance ...............................260°C/W
V–
) ....................................... ±2.5V to ±9V
S
) ......................... –40°C to +85°C
J
Lead Temperature (soldering, 5 sec.) ....................... 260°C
Storage Temperature (T
) ........................................ 150°C
S
ESD Rating, Note 3 ................................................... 1.5kV
Electrical Characteristics (±5V)
VV+ = +5V, VV– = –5V, VCM = 0V, V
Symbol Parameter Condition Min Typ Max Units
V
OS
V
OS
Input Offset Voltage 1 15 mV
Input Offset Voltage 4 µV/°C
Temperature Coefficient
I
I
V
B
OS
CM
Input Bias Current 3.5 5.5 µA
Input Offset Current 0.05 3 µA
Input Common-Mode Range CMRR > 60dB –3.25 +3.25 V
CMRR Common-Mode Rejection Ratio –2.5V < V
PSRR Power Supply Rejection Ratio ±5V < V
A
V
VOL
OUT
Large-Signal Voltage Gain RL = 2k, V
Maximum Output Voltage Swing positive, RL = 2kΩ +3.3 3.5 V
GBW Gain-Bandwidth Product RL = 1kΩ 170 MHz
BW –3dB Bandwidth AV = 1, RL = 100Ω 150 MHz
SR Slew Rate 325 V/µs
I
GND
I
GND
Short-Circuit Output Current source 72 mA
Supply Current 2.4 3.5 mA
= 0V; RL = 10MΩ; TJ = 25°C, bold values indicate –40°C ≤ TJ ≤ +85°C; unless noted.
OUT
< +2.5V 70 90 dB
CM
60 dB
< ±9V 74 81 dB
S
70 dB
= ±2V 60 71 dB
OUT
RL = 200Ω, V
= ±2V 60 71 dB
OUT
+3.0 V
negative, R
positive, R
= 2kΩ –3.5 –3.3 V
L
= 200Ω +3.0 3.2 V
L
+2.75 V
negative, R
= 200Ω –2.8 –2.45 V
L
sink 25 mA
9 µA
–3.0 V
–2.2 V
4.1 mA
Electrical Characteristics
VV+ = +9V, VV– = –9V, VCM = 0V, V
Symbol Parameter Condition Min Typ Max Units
V
OS
V
OS
Input Offset Voltage 1 15 mV
Input Offset Voltage 4 µV/°C
Temperature Coefficient
I
I
B
OS
Input Bias Current 3.5 5.5 µA
Input Offset Current 0.05 3 µA
MIC912 2 June 2000
= 0V; RL = 10MΩ; TJ = 25°C, bold values indicate –40°C ≤ TJ ≤ +85°C; unless noted
OUT
9 µA
Page 3
MIC912 Micrel
c
r
Symbol Parameter Condition Min Typ Max Units
V
CM
CMRR Common-Mode Rejection Ratio –6.5V < V
A
VOL
V
OUT
GBW Gain-Bandwidth Product RL = 1kΩ 200 MHz
SR Slew Rate 360 V/µs
I
GND
I
GND
Note 1. Exceeding the absolute maximum rating may damage the device.
Note 2. The device is not guaranteed to function outside its operating rating.
Note 3. Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5k in series with 100pF.
Note 4. Exceeding the maximum differential input voltage will damage the input stage and degrade performance (in particular, input bias current is
Input Common-Mode Range CMRR > 60dB –7.25 +7.25 V
< 6.5V 70 98 dB
CM
60 dB
Large-Signal Voltage Gain RL = 2kΩ, V
= ±6V 60 73 dB
OUT
Maximum Output Voltage Swing positive, RL = 2kΩ +7.2 +7.4 V
+6.8 V
negative, R
= 2kΩ –7.4 –7.2 V
L
Short-Circuit Output Current source 90 mA
sink 32 mA
Supply Current 2.5 3.7 mA
likely to increase).
–6.8 V
4.3 mA
Test Circuits
BNC
Input
10k
BNC
Input
V
CC
10µF
0.1µF
50Ω
0.1µF
MIC912
50Ω
V
EE
2k
2
1
5
0.1µF
10µF
10k
10k
50Ω
All resistors:
1% metal film
4
3
0.1µF
PSRR vs. Frequency
BNC
Output
10pF
100pF
R2 4k
V
CC
R2
5k
10µF
BNC
Input
VV
V
CC
10µF
R1 5k
R7c 2k
R7b 200Ω
R7a 100Ω
All resistors 1%
=++
OUT ERROR
R6
5k
200k
R2R1R2 R R4
1
CMRR vs. Frequency
R3
250Ω
R4
4
MIC912
3
R5
5k
V
++
5
R7
EE
0.1µF
2
5
0.1µF
10µF
1
BNC
Output
R1
20Ω
R5
20Ω
R3 27k
S1
S2
R4 27k
10pF
4
MIC912
3
0.1µF
2
1
5
0.1µF
10µF
V
EE
BNC
To
Dynami
Analyze
Noise Measurement
June 2000 3 MIC912
Page 4
MIC912 Micrel
Electrical Characteristics
Supply Current
vs. Supply Voltage
3.5
+85°C
3.0
2.5
SUPPLY CURRENT (mA)
2.0
2345678910
SUPPLY VOLTAGE (±V)
+25°C
-40°C
Bias Current
vs. Temperature
5
4
V
= ±5V
V
SUPPLY
SUPPLY
= ±9V
3
2
BIAS CURRENT (µA)
1
-40 -20 0 20 40 60 80 100
TEMPERATURE (°C)
Supply Current
vs. Temperature
4.0
3.5
V
= ±9V
SUPPLY
3.0
2.5
SUPPLY CURRENT (mA)
2.0
-40 -20 0 20 40 60 80 100
V
= ±5V
SUPPLY
TEMPERATURE (°C)
Offset Voltage
vs. Common-Mode Voltage
6
5
4
+85°C
3
2
1
OFFSET VOLTGE (mV)
+25°C
0
-8-6-4-202468
COMMON-MODE VOLTAGE (V)
V
SUPPLY
= ±9V
-40°C
Offset Voltage
vs. Temperature
2.5
V
= ±5V
SUPPLY
2.0
V
= ±9V
1.5
OFFSET VOLTAGE (mV)
1.0
-40 -20 0 20 40 60 80 100
SUPPLY
TEMPERATURE (°C)
Offset Voltage
vs. Common-Mode Voltage
5
4
3
2
-40°C
1
OFFSET VOLTGE (mV)
0
-5 -4 -3 -2 -1 0 1 2 3 4 5
COMMON-MODE VOLTAGE (V)
+85°C
+25°C
V
SUPPLY
= ±5V
Short-Circuit Current
vs. Temperature
95
90
85
80
75
70
65
SUPPLY CURRENT (mA)
60
55
-40 -20 0 20 40 60 80 100
V
SUPPLY
SOURCING
CURRENT
V
= ±5V
SUPPLY
TEMPERATURE (°C)
= ±9V
Short-Circuit Current
vs. Supply Voltage
-15
-20
-25
-30
-35
SINKING
OUTPUT CURRENT (mA)
CURRENT
-40
2345678910
SUPPLY VOLTAGE (±V)
-40°C
+85°C
+25°C
Short-Circuit Current
vs. Temperature
-20
-25
-30
-35
SUPPLY CURRENT (mA)
-40
-40 -20 0 20 40 60 80 100
V
= ±5V
SUPPLY
SINKING
CURRENT
V
= ±9V
SUPPLY
TEMPERATURE (°C)
Output Voltage
vs. Output Current
10
9
8
7
6
5
4
3
2
OUTPUT VOLTAGE (V)
SOURCING
1
CURRENT
0
0 20406080100
OUTPUT CURRENT (mA)
V
SUPPLY
+85°C
= ±9V
+25°C
-40°C
Short-Circuit Current
vs. Supply Voltage
100
80
60
40
OUTPUT CURRENT (mA)
20
2345678910
-40°C
+25°C
+85°C
SOURCING
CURRENT
SUPPLY VOLTAGE (±V)
Output Voltage
vs. Output Current
0
-1
-2
-3
-4
+25°C
-5
-6
-7
-8
OUTPUT VOLTAGE (V)
V
-9
SUPPLY
-10
-40 -30 -20 -10 0
OUTPUT CURRENT (mA)
-40°C
+85°C
= ±9V
SINKING
CURRENT
MIC912 4 June 2000
Page 5
MIC912 Micrel
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
0 20406080
OUTPUT VOLTAGE (V)
OUTPUT CURRENT (mA)
-10
-9
-8
-7
-6
-5
-4
-3
-2
-1
0
-30 -25 -20 -15 -10 -5 0
OUTPUT VOLTAGE (V)
OUTPUT CURRENT (mA)
Output Voltage
vs. Output Current
+85°C
+25°C
-40°C
SINKING
CURRENT
V
SUPPLY
= ±5V
0
20
40
60
80
100
1x1021x1031x1041x1051x1061x10
7
+PSRR (dB)
FREQUENCY (Hz)
0
20
40
60
80
100
1x1021x1031x1041x1051x1061x10
7
+PSRR (dB)
FREQUENCY (Hz)
Output Voltage
vs. Output Current
V
= ±5V
SUPPLY
+25°C
Gain Bandwidth and
Phase Margin vs. Load
250
200
150
100
50
GAIN BANDWIDTH (MHz)
0
0 200 400 600 800 1000
V
= ±9V
SUPPLY
CAPACITIVE LOAD (pF)
Common-Mode
120
100
CMRR (dB)
Rejection Ratio
80
60
40
20
V
= ±5V
SUPPLY
0
1x1021x1031x1041x1051x1061x10
FREQUENCY (Hz)
+85°C
SOURCING
CURRENT
Gain Bandwidth and
Phase Margin vs. Supply Voltage
50
40
30
20
PHASE MARGIN (°)
10
0
250
200
150
100
50
GAIN BANDWIDTH (MHz)
0
2345678910
SUPPLY VOLTAGE (±V)
Positive Power Supply
Rejection Ratio
V
SUPPLY
7
= ±9V
-40°C
Common-Mode
25
20
15
10
PHASE MARGIN (°)
5
0
120
100
CMRR (dB)
Rejection Ratio
80
60
40
20
V
= ±9V
SUPPLY
0
1x1021x1031x1041x1051x1061x10
FREQUENCY (Hz)
7
Negative Power Supply
100
–PSRR (dB)
Rejection Ratio
80
60
40
20
0
V
= ±9V
SUPPLY
1x1021x1031x1041x1051x1061x10
FREQUENCY (Hz)
7
June 2000 5 MIC912
Positive Power Supply
Rejection Ratio
V
= ±5V
SUPPLY
Negative Power Supply
100
–PSRR (dB)
Rejection Ratio
80
60
40
20
0
V
= ±5V
SUPPLY
1x1021x1031x1041x1051x1061x10
FREQUENCY (Hz)
7
Page 6
MIC912 Micrel
-30
-20
-10
0
10
20
30
40
50
60
70
-135
-90
-45
0
45
90
135
180
225
270
315
1x1051x1061x1071x1085x10
8
GAIN (dB)
PHASE (°)
FREQUENCY (MHz)
Open-Loop
70
60
50
40
30
20
GAIN (dB)
10
0
-10
VCC = ±5V
-20
1x1051x1061x1071x1085x10
Gain
50pF
20pF
1000pF
500pF
200pF
100pF
FREQUENCY (MHz)
Open-Loop
70
60
50
40
30
20
GAIN (dB)
10
0
-10
VCC = ±9V
-20
1x1051x1061x1071x1085x10
Gain
50pF
20pF
1000pF
500pF
200pF
100pF
FREQUENCY (MHz)
CL =
CL =
10pF
10pF
0pF
0pF
Open-Loop
Frequency Response
RL = 100Ω
No Load
VCC = ±5V
8
Open-Loop
Frequency Response
70
60
50
40
30
20
10
GAIN (dB)
0
-10
-20
VCC = ±9V
8
-30
1x1051x1061x1071x1085x10
FREQUENCY (MHz)
RL = 100Ω
No Load
315
270
225
180
135
90
45
0
-45
-90
-135
8
PHASE (°)
Voltage
120
Hz
100
nV
80
60
40
20
NOISE VOL TAGE
0
1x1011x1021x1031x1041x10
Noise
FREQUENCY (Hz)
5
250
200
150
100
SLEW RATE (V/µs)
50
0
0 200 400 600 800 1000
Current
5
Hz
4
pA
3
MIC912 6 June 2000
2
1
NOISE CURRENT
0
1x1011x1021x1031x1041x10
Noise
FREQUENCY (Hz)
350
300
250
200
150
100
SLEW RATE (V/µs)
50
5
0
0 200 400 600 800 1000
Positive
Slew Rate
VCC = ±5V
LOAD CAPACITANCE (pF)
Positive
Slew Rate
VCC = ±9V
LOAD CAPACITANCE (pF)
Negative
350
300
250
200
150
100
SLEW RATE (V/µs)
50
0
0 200 400 600 800 1000
Slew Rate
VCC = ±5V
LOAD CAPACITANCE (pF)
Negative
400
350
300
250
200
150
100
SLEW RATE (V/µs)
50
0
0 200 400 600 800 1000
Slew Rate
VCC = ±9V
LOAD CAPACITANCE (pF)
Page 7
MIC912 Micrel
OUTPUT INPUT
Small-Signal
Pulse Response
VCC = ±9V
= 1
A
V
= 1.7pF
C
L
= 100Ω
R
L
Small-Signal
Pulse Response
VCC = ±9V
= 1
A
V
= 100pF
C
L
= 100Ω
R
L
OUTPUT INPUT
Small-Signal
Pulse Response
VCC = ±5V
= 1
A
V
= 1.7pF
C
L
= 100Ω
R
L
Small-Signal
Pulse Response
VCC = ±5V
= 1
A
V
= 100pF
C
L
= 100Ω
R
L
OUTPUT INPUT
OUTPUT INPUT
Small-Signal
Pulse Response
VCC = ±9V
= 1
A
V
= 1000pF
C
L
= 100Ω
R
L
OUTPUT INPUT
OUTPUT INPUT
Small-Signal
Pulse Response
VCC = ±5V
= 1
A
V
= 1000pF
C
L
= 100Ω
R
L
June 2000 7 MIC912
Page 8
MIC912 Micrel
OUTPUT
Large-Signal
Pulse Response
∆V = 4.44V
∆t = 19.0ns
Large-Signal
Pulse Response
VCC = ±9V
= 1
A
V
= 1.7pF
C
L
VCC = ±9V
= 1
A
V
= 100pF
C
L
OUTPUT
Large-Signal
Pulse Response
∆V = 4.48V
∆t = 20.0ns
Large-Signal
Pulse Response
VCC = ±5V
= 1
A
V
= 1.7pF
C
L
VCC = ±5V
= 1
A
V
= 100pF
C
L
OUTPUT
OUTPUT
∆V = 4.68V
∆t = 18.0ns
Large-Signal
Pulse Response
∆V = 4.76V
∆t = 66ns
VCC = ±9V
= 1
A
V
= 1000pF
C
L
OUTPUT
OUTPUT
∆V = 4.80V
∆t = 21.5ns
∆V = 4.56V
∆t = 80ns
Large-Signal
Pulse Response
VCC = ±5V
= 1
A
V
= 1000pF
C
L
MIC912 8 June 2000
Page 9
MIC912 Micrel
PVVI
DVV
S
(noload)
=−
()
+−
TotalPowerDissipation P P
DDt
=+
(noload) (outpu stage)
Applications Information
The MIC912 is a high-speed, voltage-feedback operational
amplifier featuring very low supply current and excellent
stability. This device is unity gain stable with RL ≤ 200Ω and
capable of driving high capacitance loads.
Stability Considerations
The MIC912 is unity gain stable and it is capable of driving
unlimited capacitance loads, but some design considerations
are required to ensure stability.
loaded with 200Ω resistance or less and/or have sufficient load capacitance to achieve stability (refer to the
“Load Capacitance vs. Phase Margin” graph).
For applications requiring a little less speed, Micrel offers the
MIC910, a more heavily compensated version of the MIC912
which provides extremely stable operation for all load resistance and capacitance.
Driving High Capacitance
The MIC912 is stable when driving high capacitance (see
“Typical Characteristics: Gain Bandwidth and Phase Margin
vs. Load Capacitance”) making it ideal for driving long coaxial
cables or other high-capacitance loads.
Phase margin remains constant as load capacitance is
increased. Most high-speed op amps are only able to drive
limited capacitance.
Note: increasing load capacitance does reduce the
speed of the device (see “Typical Characteristics: Gain Bandwidth and Phase Margin vs.
Load”). In applications where the load capacitance reduces the speed of the op amp to an
unacceptable level, the effect of the load capacitance can be reduced by adding a small resistor
(<100Ω) in series with the output.
Feedback Resistor Selection
Conventional op amp gain configurations and resistor selection apply, the MIC912 is NOT a current feedback device.
Resistor values in the range of 1k to 10k are recommended.
The output needs to be
Layout Considerations
All high speed devices require careful PCB layout. The
following guidelines should be observed: Capacitance, particularly on the two inputs pins will degrade performance;
avoid large copper traces to the inputs. Keep the output signal
away from the inputs and use a ground plane.
It is important to ensure adequate supply bypassing capacitors are located close to the device.
Power Supply Bypassing
Regular supply bypassing techniques are recommended. A
10µF capacitor in parallel with a 0.1µF capacitor on both the
positive and negative supplies are ideal. For best performance all bypassing capacitors should be located as close to
the op amp as possible and all capacitors should be low ESL
(equivalent series inductance), ESR (equivalent series resistance). Surface-mount ceramic capacitors are ideal.
Thermal Considerations
The SOT-23-5 package, like all small packages, has a high
thermal resistance. It is important to ensure the IC does not
exceed the maximum operating junction (die) temperature of
85°C. The part can be operated up to the absolute maximum
temperature rating of 125°C, but between 85°C and 125°C
performance will degrade, in particular CMRR will reduce.
An MIC912 with no load, dissipates power equal to the
quiescent supply current * supply voltage
When a load is added, the additional power is dissipated in
the output stage of the op amp. The power dissipated in the
device is a function of supply voltage, output voltage and
output current.
PVVI
DV
(outputstage)
Ensure the total power dissipated in the device is no greater
than the thermal capacity of the package. The SOT23-5
package has a thermal resistance of 260°C/W.
=−
()
+
OUT OUT
June 2000 9 MIC912
Max AllowablePowerDissipation
. =
TT
−
JA
(max) (max)
260W
Page 10
MIC912 Micrel
Package Information
1.90 (0.075) REF
0.95 (0.037) REF
3.02 (0.119)
2.80 (0.110)
0.50 (0.020)
0.35 (0.014)
1.75 (0.069)
1.50 (0.059)
1.30 (0.051)
0.90 (0.035)
0.15 (0.006)
0.00 (0.000)
SOT-23-5 (M5)
3.00 (0.118)
2.60 (0.102)
10°
0°
DIMENSIONS:
MM (INCH)
0.20 (0.008)
0.09 (0.004)
0.60 (0.024)
0.10 (0.004)
MIC912 10 June 2000
Page 11
MIC912 Micrel
June 2000 11 MIC912
Page 12
MIC912 Micrel
MICREL INC. 1849 FORTUNE DRIVE SAN JOSE, CA 95131 USA
TEL + 1 (408) 944-0800 FAX + 1 (408) 944-0970 WEB http://www.micrel.com
This information is believed to be accurate and reliable, however no responsibility is assumed by Micrel for its use nor for any infringement of patents or
other rights of third parties resulting from its use. No license is granted by implication or otherwise under any patent or patent right of Micrel Inc.
© 2000 Micrel Incorporated
MIC912 12 June 2000
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